One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,13)(12,14)(15,16) involution — undirected(2,5)(3,7)(9,11,12,15)(10,13,14,16)(17,18)(19,28)(20,25)(21,29)(22,32)(23,27)(24,30)(26,31)(10,14)(13,16)(17,19,23,26)(18,24,27,21)(20,30,22,29)(25,31,32,28)(2,5)(6,8)(17,20,23,22)(18,25,27,32)(19,29,26,30)(21,31,24,28)(1,3,4,7)(2,6,5,8)(17,21,23,24)(18,26,27,19)(20,31,22,28)(25,30,32,29)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.